Clamp for high-temperature tensile test of pipe

By designing a high-temperature tensile test fixture for pipes, clamping the end of the pipe using a combined structure of the clamping body and locking nuts, the problem of the inability to clamp the entire pipe in the prior art is solved, and the high temperature of the entire pipe is achieved Tensile testing and ease of use.

CN222299334UActive Publication Date: 2025-01-03JIANGSU CHANGBAO STEELTUBE CO LTD
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Patent Information

Application Number
CN202323566571.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-25
Publication Date
2025-01-03
Estimated Expiration
2033-12-25

AI Technical Summary

Technical Problem

The existing fixtures cannot clamp the entire pipe and cannot perform high-temperature tensile tests for the entire pipe.

Method used

A high-temperature tensile test fixture for pipes including two clamping mechanisms is designed, and a combined structure of the main body, sleeve, lock nut, plug head and clamping body is used to match the conical surface of the clamping body and clamping. The fit of the tapered surface clamps the end of the pipe and provides radial support through the plug head to ensure that the pipe does not fall off due to slippage.

Benefits of technology

The stable clamping and high-temperature tensile test of the entire pipe are achieved, which is easy to use and prevents the end of the pipe from deforming due to clamping.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a clamp for a high-temperature tensile test of a pipe, which comprises two clamping mechanisms, and each clamping mechanism comprises a main body, a sleeve, a locking nut, a chock plug and at least two clamping bodies; the clamping bodies are connected to the lower end of the main body, a clamping hole allowing the end of a pipe to stretch into is formed between the clamping bodies, the outer side wall of each clamping body is provided with a matching conical surface part inclining towards the outer side from top to bottom, the inner side wall of the sleeve is provided with a clamping conical surface part with the small upper portion and the large lower portion, and the clamping conical surface parts are matched with the matching conical surface parts. The sleeve is arranged on the outer side of the clamping body in a sleeving mode, the clamping conical surface portion abuts against the matching conical surface portion, the locking nut is connected to the main body in a threaded mode, and the locking nut is used for driving the sleeve to move downwards so as to drive the clamping body to be folded towards the middle to clamp the end of the pipe in the clamping hole. The chock plug is used for being installed on the inner side of the end of the pipe. According to the utility model, the whole pipe can be clamped, so that a high-temperature tensile test can be carried out on the whole pipe.
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Description

Technical Field

[0001] The utility model relates to a clamp for high-temperature tensile testing of pipes. Background Art

[0002] At present, for parts that work in high temperature environments for a long time, high temperature tensile tests need to be carried out to detect whether the high temperature mechanical properties of the parts meet the working requirements. During the high temperature tensile test, a clamp is needed to clamp the two ends of the parts. For pipe parts, the best solution is to perform high temperature tensile testing on the entire pipe, but some existing clamps cannot clamp the entire pipe, so it is impossible to perform high temperature tensile testing on the entire pipe. For example, a Chinese patent with publication number CN106483025A discloses a high temperature and high pressure water slow tensile test clamp for thin-walled pipe arc specimens, and a Chinese patent with publication number CN204228518U discloses a clamp for a high temperature tensile machine for pipes. Both of the above clamps can only clamp arc specimens, but cannot clamp the entire pipe, so it is impossible to perform high temperature tensile testing on the entire pipe. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a clamp for high-temperature tensile test of pipes, which can clamp the entire pipe and then perform a high-temperature tensile test on the entire pipe.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a fixture for high temperature tensile test of pipes, which includes two clamping mechanisms, one of which is used to clamp one end of the pipe, and the other clamping mechanism is used to clamp the other end of the pipe;

[0005] The clamping mechanism comprises a main body, a sleeve, a locking nut, a plug and at least two clamping bodies;

[0006] The clamping body is connected to the lower end of the main body, and a clamping hole for the end of the pipe to extend into is provided between the clamping bodies;

[0007] The outer wall of the clamping body is provided with a matching conical surface portion which is inclined from top to bottom and outward;

[0008] The inner side wall of the sleeve is provided with a clamping conical surface portion which is smaller at the top and larger at the bottom; the sleeve is sleeved on the outer side of the clamping body and the clamping conical surface portion abuts against the matching conical surface portion;

[0009] The locking nut is threadedly connected to the main body, and the locking nut is used to abut against the upper end of the sleeve and drive the sleeve to move downward during rotation, so that the clamping conical surface is pressed against the matching conical surface, and then the clamping body is closed toward the middle to clamp the end of the pipe in the clamping hole;

[0010] The plug is used to be installed on the inner side of the end of the pipe to provide radial support for the pipe.

[0011] A specific connection structure between the clamping body and the main body is further provided, wherein the clamping body is slidably connected to the lower end of the main body along the radial direction of the main body.

[0012] Furthermore, the clamping body is provided with two, the lower end of the main body is provided with a T-shaped slot, the upper end of the clamping body is provided with a T-shaped block adapted to the T-shaped slot, the T-shaped block is slidably fitted in the T-shaped slot so that the upper end of the clamping body is radially slidably connected to the main body.

[0013] Furthermore, the clamping body is provided with a half hole portion, and the half hole portions on the two clamping bodies surround and form the clamping hole.

[0014] In order to further prevent the pipe from falling off due to slipping, anti-slip teeth are provided in the half hole portion.

[0015] A specific structure of the main body is further provided, wherein the main body is provided with a main threaded portion, and the locking nut is threadedly connected to the main threaded portion.

[0016] Furthermore, a mounting stud portion is provided at the upper end portion of the main body.

[0017] Furthermore, at least two screwing plane parts are provided on the main body.

[0018] Another specific connection structure between the clamping body and the main body is further provided, wherein the clamping body is provided with a plurality of clamping bodies and arranged in sequence along the circumferential direction with the clamping hole as the center, the clamping body and the main body are integrally formed, and a spacing groove is provided between any adjacent clamping bodies.

[0019] Furthermore, anti-slip teeth are provided on the end surface of the clamping body facing the clamping hole.

[0020] After adopting the above technical solution, the process of the clamping mechanism clamping the pipe is to first insert the plug into the end of the pipe, then extend the end of the pipe into the clamping hole, and then tighten the locking nut so that the locking nut drives the sleeve to move downward, and then the clamping body is driven to close to the middle and clamp the end of the pipe through the cooperation of the clamping cone surface and the matching cone surface. In the embodiment of the present application, there are two clamping mechanisms, one of which is used to clamp one end of the pipe, and the other is used to clamp the other end of the pipe. Then the two clamping mechanisms are installed on the tensile testing machine, and the tensile testing machine drives the two clamping mechanisms away from each other so as to perform a high-temperature tensile test on the whole pipe. The clamp for high-temperature tensile testing of pipes using the embodiment of the present application can clamp the whole pipe, and then perform a high-temperature tensile test on the whole pipe, which is very convenient to use; and the plug inserted into the pipe provides radial support for the pipe, which can prevent the end of the pipe from being deformed by being clamped by the clamping body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of two clamping mechanisms of the utility model clamping the two ends of the pipe;

[0022] Figure 2 This is a schematic diagram of the external structure of the fixture for high temperature tensile test of pipes in the first embodiment of the utility model;

[0023] Figure 3 It is a cross-sectional view of the fixture for high temperature tensile test of pipes in the first embodiment of the utility model;

[0024] Figure 4 This is an exploded view of the assembly of the fixture for high temperature tensile test of pipes in the first embodiment of the utility model;

[0025] Figure 5 This is a schematic structural diagram of the main body in the first embodiment of the present utility model;

[0026] Figure 6 It is a left side view of the clamping body in the first embodiment of the utility model;

[0027] Figure 7 It is a right side view of the clamping body in the first embodiment of the utility model;

[0028] Figure 8 for Figure 7 A top view of

[0029] Fig. 9 for Figure 7 A top sectional view of

[0030] Fig.10This is a schematic structural diagram of a fixture for high temperature tensile testing of pipes in the second embodiment of the utility model;

[0031] Fig.11 It is a cross-sectional view of a fixture for high temperature tensile test of a pipe in the second embodiment of the present utility model;

[0032] Fig.12 It is a schematic structural diagram of the main body and the clamping body in the second embodiment of the utility model. DETAILED DESCRIPTION

[0033] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0034] Embodiment 1

[0035] like Figures 1 to 9 As shown, a fixture for high temperature tensile test of a pipe comprises two clamping mechanisms 100, wherein one of the clamping mechanisms 100 is used to clamp one end of a pipe 200, and the other clamping mechanism 100 is used to clamp the other end of the pipe 200;

[0036] The clamping mechanism 100 comprises a main body 1, a sleeve 2, a locking nut 3, a plug 4 and at least two clamping bodies 5;

[0037] The clamping body 5 is connected to the lower end of the main body 1, and a clamping hole 6 is provided between the clamping bodies 5 for the end of the pipe 200 to extend into;

[0038] The outer wall of the clamping body 5 is provided with a matching conical surface portion 7 which is inclined downward and outward from top to bottom;

[0039] The inner wall of the sleeve 2 is provided with a clamping conical surface portion 8 which is smaller at the top and larger at the bottom. The sleeve 2 is sleeved on the outer side of the clamping body 5 and the clamping conical surface portion 8 abuts against the matching conical surface portion 7.

[0040] The locking nut 3 is threadedly connected to the main body 1, and is used to abut against the upper end of the sleeve 2 and drive the sleeve 2 to move downward during rotation, so that the clamping conical surface 8 abuts against the matching conical surface 7, thereby driving the clamping body 5 to close toward the middle to clamp the end of the pipe 200 in the clamping hole 6;

[0041] The plug 4 is used to be installed on the inner side of the end of the pipe 200 to provide radial support for the pipe 200; specifically, Figure 3The process of the clamping mechanism 100 clamping the pipe 200 is as follows: first, the plug 4 is inserted into the end of the pipe 200, and then the end of the pipe 200 is inserted into the clamping hole 6, and then the locking nut 3 is tightened so that the locking nut 3 drives the sleeve 2 to move downward, and then the clamping body 5 is driven to close to the middle and clamp the end of the pipe 200 through the cooperation of the clamping cone surface 8 and the matching cone surface 7. Figure 1 As shown, there are two clamping mechanisms 100 in the embodiment of the present application, one of which is used to clamp one end of the pipe 200, and the other clamping mechanism 100 is used to clamp the other end of the pipe 200, and then the two clamping mechanisms 100 are installed on the tensile testing machine, and the tensile testing machine drives the two clamping mechanisms 100 away from each other so as to perform a high-temperature tensile test on the whole pipe 200. The clamp for high-temperature tensile testing of pipes in the embodiment of the present application can clamp the whole pipe 200, and then perform a high-temperature tensile test on the whole pipe, which is very convenient to use; and the plug 4 is inserted into the pipe 200 to provide radial support for the pipe 200, which can prevent the end of the pipe 200 from being clamped by the clamping body 5 and deformed.

[0042] like Figures 3 to 7 As shown, the clamping body 5 is connected to the lower end of the main body 1 along the radial sliding of the main body 1. When the locking nut 3 is rotated and the sleeve 2 is driven to move downward, the clamping conical surface 8 on the sleeve 2 presses against the matching conical surface 7 and drives the clamping body 5 to slide toward the middle and close to clamp the end of the pipe 200 in the clamping hole 6.

[0043] like Figures 2 to 7 As shown, the clamping body 5 is provided with two, the lower end of the main body 1 is provided with a T-shaped slot 9, the upper end of the clamping body 5 is provided with a T-shaped block 10 adapted to the T-shaped slot 9, and the T-shaped block 10 is slidably fitted in the T-shaped slot 9 so that the upper end of the clamping body 5 is radially slidably connected to the main body 1.

[0044] like Figure 3 , 7 As shown in FIG. 9 , the clamping body 5 is provided with a half hole portion 11 , and the two half hole portions 11 on the clamping body 5 surround and form the clamping hole 6 .

[0045] like Figure 3 , 7 As shown in FIG. 9 , the semi-hole portion 11 is provided with anti-slip teeth 12 to prevent the pipe 200 from slipping and falling off after being clamped.

[0046] like Figures 2 to 5As shown, the main body 1 is provided with a main threaded portion 13, and the locking nut 3 is threadedly connected to the main threaded portion 13; the upper end of the main body 1 is provided with a mounting stud portion 14, and the main body 1 is connected to the tensile testing machine through the mounting stud portion 14; the main body 1 is provided with at least two screwing plane portions 15, and in this embodiment, the screwing plane portions 15 are provided with two, and the two screwing plane portions 15 are arranged opposite to each other at 180°, and the screwing plane portions 15 can cooperate with a wrench. Specifically, the fixture for high-temperature tensile testing of pipes in the embodiment of the present application can be used in the whole-pipe high-temperature tensile testing of small-diameter thin-walled pipes.

[0047] Embodiment 2

[0048] like Figure 1 , 10 , 11 and 12, another clamp for high temperature tensile test of pipes, which includes two clamping mechanisms 100, one of which is used to clamp one end of the pipe 200, and the other clamping mechanism 100 is used to clamp the other end of the pipe 200;

[0049] The clamping mechanism 100 comprises a main body 1, a sleeve 2, a locking nut 3, a plug 4 and at least two clamping bodies 5;

[0050] The clamping body 5 is connected to the lower end of the main body 1, and a clamping hole 6 is provided between the clamping bodies 5 for the end of the pipe 200 to extend into;

[0051] The outer wall of the clamping body 5 is provided with a matching conical surface portion 7 which is inclined downward and outward from top to bottom;

[0052] The inner wall of the sleeve 2 is provided with a clamping conical surface portion 8 which is smaller at the top and larger at the bottom. The sleeve 2 is sleeved on the outer side of the clamping body 5 and the clamping conical surface portion 8 abuts against the matching conical surface portion 7.

[0053] The locking nut 3 is threadedly connected to the main body 1, and is used to abut against the upper end of the sleeve 2 and drive the sleeve 2 to move downward during rotation, so that the clamping conical surface 8 abuts against the matching conical surface 7, thereby driving the clamping body 5 to close toward the middle to clamp the end of the pipe 200 in the clamping hole 6;

[0054] The plug 4 is used to be installed on the inner side of the end of the pipe 200 to provide radial support for the pipe 200; specifically, Figure 3The process of the clamping mechanism 100 clamping the pipe 200 is as follows: first, the plug 4 is inserted into the end of the pipe 200, and then the end of the pipe 200 is inserted into the clamping hole 6, and then the locking nut 3 is tightened so that the locking nut 3 drives the sleeve 2 to move downward, and then the clamping body 5 is driven to close to the middle and clamp the end of the pipe 200 through the cooperation of the clamping cone surface 8 and the matching cone surface 7. Figure 1 As shown, there are two clamping mechanisms 100 in the embodiment of the present application, one of which is used to clamp one end of the pipe 200, and the other clamping mechanism 100 is used to clamp the other end of the pipe 200, and then the two clamping mechanisms 100 are installed on the tensile testing machine, and the tensile testing machine drives the two clamping mechanisms 100 away from each other so as to perform a high-temperature tensile test on the whole pipe 200. The clamp for high-temperature tensile testing of pipes in the embodiment of the present application can clamp the whole pipe 200, and then perform a high-temperature tensile test on the whole pipe, which is very convenient to use; and the plug 4 is inserted into the pipe 200 to provide radial support for the pipe 200, which can prevent the end of the pipe 200 from being clamped by the clamping body 5 and deformed.

[0055] like Figures 10-12 As shown, the clamping body 5 is provided with a plurality of them and arranged in sequence along the circumferential direction with the clamping hole 6 as the center. The clamping body 5 is integrally formed with the main body 1, and a spacing groove 16 is provided between any adjacent clamping bodies 5. When the locking nut 3 is rotated and the sleeve 2 is driven to move downward, the clamping conical surface portion 8 on the sleeve 2 presses against the matching conical surface portion 7 and thereby drives the clamping body 5 to deform toward the middle and close to clamp the end of the pipe 200 in the clamping hole 6; in this embodiment, the clamping body 5 is provided with 8.

[0056] like Figures 10-12 As shown, anti-slip teeth 12 are provided on the end surface of the clamping body 5 facing the clamping hole 6 to prevent the pipe 200 from slipping and falling off after being clamped.

[0057] like Figures 10-12 As shown, the main body 1 may be provided with a main threaded portion 13, and the locking nut 3 is threadedly connected to the main threaded portion 13; the upper end of the main body 1 is provided with a mounting stud portion 14, and the main body 1 is connected to the tensile testing machine through the mounting stud portion 14; at least two screwing plane portions 15 are provided on the main body 1, and in this embodiment, the screwing plane portions 15 are provided with two, and the two screwing plane portions 15 are arranged opposite to each other at 180°, and the screwing plane portions 15 can cooperate with a wrench; specifically, the fixture for high-temperature tensile testing of pipes in the embodiment of the present application can be used in the whole-pipe high-temperature tensile testing of small-diameter thin-walled pipes.

[0058] In summary, the process of the clamping mechanism 100 clamping the pipe 200 is to first insert the plug 4 into the end of the pipe 200, then extend the end of the pipe 200 into the clamping hole 6, and then tighten the locking nut 3 so that the locking nut 3 drives the sleeve 2 to move downward, and then drive the clamping body 5 to close to the middle and clamp the end of the pipe 200 through the cooperation of the clamping cone surface 8 and the matching cone surface 7. In the embodiment of the present application, there are two clamping mechanisms 100, one of which is used to clamp one end of the pipe 200, and the other clamping mechanism 100 is used to clamp the other end of the pipe 200, and then the two clamping mechanisms 100 are installed on the tensile testing machine, and the tensile testing machine drives the two clamping mechanisms 100 to move away from each other so as to perform a high-temperature tensile test on the pipe 200. The clamp for high-temperature tensile testing of pipes according to the embodiment of the present application can clamp the entire pipe 200, and thus can perform a high-temperature tensile test on the entire pipe, which is very convenient to use; and the plug 4 is inserted into the pipe 200 to provide radial support for the pipe 200, which can prevent the end of the pipe 200 from being clamped and deformed by the clamping body 5.

[0059] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixture for high temperature tensile testing of pipes, characterized in that: It comprises two clamping mechanisms (100), wherein one of the clamping mechanisms (100) is used to clamp one end of a pipe (200), and the other clamping mechanism (100) is used to clamp the other end of the pipe (200); The clamping mechanism (100) comprises a main body (1), a sleeve (2), a locking nut (3), a plug (4) and at least two clamping bodies (5); The clamping body (5) is connected to the lower end of the main body (1), and a clamping hole (6) is provided between the clamping bodies (5) for the end of the pipe (200) to extend into; The outer side wall of the clamping body (5) is provided with a matching conical surface portion (7) which is inclined downward and outward from top to bottom; The inner wall of the sleeve (2) is provided with a clamping conical surface portion (8) which is smaller at the top and larger at the bottom; the sleeve (2) is sleeved on the outer side of the clamping body (5) and the clamping conical surface portion (8) abuts against the matching conical surface portion (7); The locking nut (3) is threadedly connected to the main body (1), and is used to abut against the upper end of the sleeve (2) and drive the sleeve (2) to move downward during rotation, thereby causing the clamping conical surface (8) to abut against the matching conical surface (7), thereby driving the clamping body (5) to close toward the middle to clamp the end of the pipe (200) in the clamping hole (6); The plug (4) is used to be installed on the inner side of the end of the pipe (200) to provide radial support for the pipe (200).

2. The fixture for high temperature tensile testing of pipes according to claim 1, characterized in that: The clamping body (5) is slidably connected to the lower end of the main body (1) along the radial direction of the main body (1).

3. The fixture for high temperature tensile testing of pipes according to claim 2, characterized in that: The clamping body (5) is provided with two, the lower end of the main body (1) is provided with a T-shaped slot (9), the upper end of the clamping body (5) is provided with a T-shaped block (10) adapted to the T-shaped slot (9), the T-shaped block (10) is slidably fitted in the T-shaped slot (9), thereby enabling the upper end of the clamping body (5) to be slidably connected to the main body (1) along the radial direction.

4. The fixture for high temperature tensile testing of pipes according to claim 1, characterized in that: Two clamping bodies (5) are provided, and a half hole portion (11) is provided on the clamping body (5). The half hole portions (11) on the two clamping bodies (5) surround and form the clamping hole (6).

5. The fixture for high temperature tensile testing of pipes according to claim 4, characterized in that: Anti-slip teeth (12) are provided in the half hole portion (11).

6. The fixture for high temperature tensile testing of pipes according to claim 1, characterized in that: The main body (1) is provided with a main threaded portion (13), and the locking nut (3) is threadedly connected to the main threaded portion (13).

7. The fixture for high temperature tensile testing of pipes according to claim 1, characterized in that: The upper end portion of the main body (1) is provided with a mounting stud portion (14).

8. The fixture for high temperature tensile testing of pipes according to claim 7, characterized in that: The main body (1) is provided with at least two screwing plane portions (15).

9. The fixture for high temperature tensile testing of pipes according to claim 1, characterized in that: The clamping bodies (5) are provided in plurality and are arranged in sequence along the circumferential direction with the clamping hole (6) as the center. The clamping bodies (5) are integrally formed with the main body (1), and a spacing groove (16) is provided between any adjacent clamping bodies (5).

10. The fixture for high temperature tensile testing of pipes according to claim 9, characterized in that: Anti-slip teeth (12) are provided on the end surface of the clamping body (5) facing the clamping hole (6).